Evaluation of various compounds to inhibit activity of matrix metalloproteinases in the tear film of horses with ulcerative keratitis. - Ollivier FJ; Brooks DE; Kallberg ME; Komaromy AM; Lassaline ME; Andrew SE; Gelatt KN; Stevens GR; Blalock TD; van Setten GB; Schultz GS (American journal of veterinary research, 2003)